Paper-drier.



No. 767,618. PATENTED AUG. 16, 1904v W. WHITE.

PAPER DRIER.

APPLICATION FILED APB..18, 1904.

NO MODEL. 1 TS-SHEET 1.

Witnesses:

Jill/8x207";

N0 MODEL.

Min eased:

PATENTED AUG. 16, 1904.

Y W. WHITE. PAPER DRIER.

APPLICATION FILED APR. 18, 1904.

BEETS-SHEET 3.

Patented August 16, 1904.

PATENT OFFICE.

WALLACE WHITE, OF LAWRENCE, MASSACHUSETTS.

PAPER-DRIER.

SPECIFICATION forming part of Letters Patent No. 767,618, dated August 16, 1904.

Application filed April 18, 1904. Serial No. 203,564. (No model.)

To all whom it may concern.-

Be it known thatLWALLAoE WHITE, of Lawrence, county of Essex, State of Massachusetts, have invented an Improvement in Paper- Driers, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

In paper-driers for drying a web of paper as it comes from the web-forming part of a papermachine the cylindrical driers are usually arranged either in a single series in which the axes of the driers are in the same horizontal plane or in a double series in which the driers in the upper series are over the spaces between the driers of the lower series, the paper passing successively from one drier to the next succeeding drier. The chief objections to these forms of driers as ordinarily employed are as follows: With the single series one side of the paper only can be run in contact with the driers, so that the paper is not evenly finished on each side, and the percentage of paper on the driers to the floor-space occupied is small, and 'with the double-series arrangement the paper is liable to blister, blistering being due to the fact that the surfaces of the paper become dry and hard before all the moisture in the paper can escape, which moisture subsequently expands upon evaporation and makes the surface of the paper uneven.

From my observations and experience I I have reached the conclusion that blistering may be at all times avoided if ample opportunIty is afforded for the escape of vapor or steam from the paper as fast as the moisture therein is evaporated.

The ob ects of my invention are to produce a form of double-series paper-drier which that the starting of the web through the drier is greatly facilitated and the continued feeding thereof in case it should break will not be interrupted.

Figure l is a side elevation of a paper-drier made according to my invention. Fig. 2 is an end view thereof, and Fig. 3 is a sectional view on the line 00 mof Fig. 1. Fig. 4 is a side elevation of a modified form of my invention.

As any Well-known means for driving the driers may be provided, such means is not illustrated.

The drier comprises the frame (0, having a series of bearings in which the lower series of cylindrical driers 6 d b 6 &c., are journaled, the axes of said driers being in the same horizontal plane. The frameis provided with a series of upwardly and backwardly extending arms a, in the upper ends of which are provided a series of journals in which the upper driers 0 0 0 &c., are journaled. It will be understood that any number of said driers may be provided. The axes of the driers of the upper series are directly over the middle of the space between the peripheries of the adjacent lower driers and said driers are all so arranged with relation to each other that a line tangent to any one of the upper driers and the second lower drier in advance thereof will not touch the peripheries of the two intermediate upper and lower driers, but

will pass midway therebetween at a suitable distance therefrom.

A series of felt-rolls 0 cl d (V, &c., and a series of felt-rolls e e 6 0 &c., are journaled in the frame, one of the felt-rolls 0 (Z CZ (Z &c., being arranged in close proximity and preceding each lower drier 6 6 6 &c. and one of the felt-rolls e 0 0 &c., being arranged in close proximity and in advance of each upper drier 0 c 0 &c., the felt-roll 0 being arranged directly over the first lower drier b.

An endless lower felt f passes over the first felt-roll 0, down beneath the first lower drier b, then about the felt-roll 6 then downwardly beneath and about the second lower drier b and upwardly over the next felt-roll e, thence downwardly beneath the next succeeding lower drier and upwardly over the felt-roll drier b '0, and so on until it is passed over an end feltroll a, down beneath the machine, and back over the first roll 0. In like manner an endless upper felt passes about the felt-roll (Z, over and. about the first upper drier c, then about the second felt-roll (Z and in like manner about the succeeding driers and felt-rolls, and returns above the driers, as shown in Fig. 1. The felts engage about one-half the circumference of the driers about which they pass.

A transferring-plate or doctor it is supported on the frame adjacent and in the rear of each lower drier b, said doctors each being provided with a sharp or beveled edge, which lies closely against the surface of its corresponding drier, as Z). and extends therefrom to the then upper side of the upper felt g as it is drawn upwardly and rearwardly from the immediately preceding felt-roll (Z to the next preceding upper drier c. A second series of transferring-plates or doctors 71 are secured to the frame and are similarly arranged in advance of each upper drier, each plate having a sharp or beveled edge. bearing on one of the upper driers at one edge and extending obliquely downward, so that it overlaps the lower felt as it is bent about one of the feltrolls (2 e, &c., and passed down about the next succeeding lower drier, as 6 in advance thereof.

The paper-web p is fed to the driers and passes over a paper-roll p, down beneath the first drier 6, between the drier and the lower felt f, then up about a paper-roll p and then down on the felt f until it is carried beneath the next lower drier 6 between the felt f and the surface thereof. The paper-web is held in contact with the drier b by the felt f until it reaches a point nearly directly over said drier, and then the web, which normally adheres somewhat to the surface of the roll, will be lifted therefrom by the doctor It, so that the end of the web will slide over the doctor onto the then upper side of the upper felt As the felt travels obliquely upward from the doctor it the end portion of the web will be carried upward and rearward thereon until it is held between the upper drier c and the felt g. The web will then be rolled onto the drier 0 and held against its surface until it is lifted therefrom by the doctor 2' at the opposite side of the drier 0. The web then passes down over said doctor?) onto the lower felt f again just after the latter is bent about the felt-roll a, so that it will be carried down over the lower drier 6 and beneath the next succeeding lower In like manner the web will be automatically conducted successively from one lower drier up about the next preceding upper drier and then down about the next succeeding lower drier, and so on throughout the whole series of driers. In case the paper-web should break by reason of shrinkage the por tion following the break will be fed along as if the break had not occurred.

It will be apparent from an inspection of Fig. 1 of the drawings that a portion of the paper about equal in length to the diameter of one of the driers will be held out of contact with the felts and driers as it is drawn from each lower drier to the next preceding upper driers, giving ample opportunity for the steam or vapor which has been generated while the web was in contact with the lower drier to escape before it comes into contact with the next drierthat is, the next preceding upper drier. As the web leaves this upper drier and travels to the next succeeding lower drier the steam or vapor again has ample opportunity to escape, the stretch from the point of leaving an upper drier to the point of passing onto the second lower drier in advance thereof being fully twice the stretch between a lower drier and the preceding upper drier. Moreover, "the paper is at all times under the influence of the heat radiated from the uncovered surfaces of the drier, so that it is being dried almost as rapidly while out of contact with the driers as while in contact therewith, and as the paper cannot be dried any faster than the moisture therein can escape the result is that the rapidity with which the paper is dried is greatly facilitated by the ample provision of means permitting such escape. The practical advantage gained is that the driers may be reduced in number as compared with the forms in general use, or the paper may be passed through the drier at a much higher rate of speed. As the moisture is permitted to escape as fast as it is evaporated, blistering of the paper is unlikely to occur.

In Fig. 4 I show the application of my invention to a double series of driers in which the upper felt is not employed and in which the corresponding felt-rolls (Z, cl, and e and doctors it, it, and c are omitted. With this arrangement the paper-web will not be automatically conducted about the driers; but the other advantages of my invention are fully possessed thereby.

While 1 use the term felt in the specification and claims as applied to the endless belts or bands which conduct the web of paper over the driers and hold it against the drier-rolls, it will be understood that my invention is not specifically limited to the use of this particular material.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is j 1. A paper-drier comprising a double series of cylindrical driers, one arranged above the other, in which the paper-web is successively passed, in contact with the surface of said driers, alternately from a drier of one series to a drier of the other series, and in which each lower drier is respectively located in advance of the next succeeding upper drier, substantially as described.

2. A paper-drier comprising a double series of cylindrical driers, one arranged above the other, in which the paper-web is successively passed, in contact with the surface of said driers, alternately from a drier of one series to a drier of the other series, each lower drier being respectively located in advance of the next succeeding upper drier, a single continuous lower-drier felt, and means for conducting the same beneath and partly about each lower drier successively, substantially as described.

3. A paper-drier comprising a double series of cylindrical driers, one arranged above the other, in which the paper-web is successively passed alternately from a drier of one series to a drier of the other series, each lower drier being respectively located in advance of the next succeeding upper drier, an upperdrier felt, felt-rolls therefor, one of said rolls being located beneath each upper drier, and said felt passing about each of said rolls, upwardly and rearwardly over said upper driers alternately, a lower felt passing about said lower driers, and intermediate felt-rolls therefor, substantially as described.

4. A paper-drier comprising a double series of cylindrical driers, one arranged above the other, in which the paper-web is successively passed alternately from a drier of one series to a drier of the other series, each lower drier being respectively located in advance of the next succeeding upper drier, an upper-drier felt and felt-rolls therefor, one of said rolls being located beneath each upper drier, and said felt passing about each of said rolls, upwardly and rearwardly over said upper driers, alternately, a lower felt passing about said lower driers and intermediate feltrolls for said lower felt, and means for transferring the paper-Web from each lower drier to the upper side of the upper felt as it moves upwardly and rearwardly to the upper driers, substantially as described.

5. A paper-drier comprising a double series of cylindrical driers, one arranged above the other, in which the paper-web is successively passed alternately from a drier of one series to a drier of the other series, each lower drier being respectively located in advance of the next succeeding upper drier, an upper-drier felt and felt-rolls therefor, one of said rolls being located beneath each upper drier, said felt passing about each of said rolls, upwardly and rearwardly over said upper driers alternately, a lower felt passing about said lower driers, intermediate feltrolls for said lower felt, and means for transferring the paper-web from each lower drier to the upper side of the upper felt as it moves upwardly and rearwardly to the upper driers,

series to a drier 0f the other series, each lower drier being respectively located in advance of the next succeeding upper drier, an upper and a lower drier felt, an upper feltroll adjacent each lower drier and in the rear thereof, and a lower felt-roll adjacent each upper drier, and in advance thereof, said upper and lower drier felts passing about their respective driers and felt rolls successively, substantially as described.

7 A paper-drier comprising a double series of cylindrical driers, one arranged above the other, in which the paper-web is successively passed alternately from a drier of one series to a drier of the other series, each lower drier being respectively located in advance of the next succeeding upper drier, an upper and a lower drier felt, an upper feltroll adjacent each lower drier and in the rear thereof, and a lower felt-rolladjacent each upper drier and in advance thereof, said upper and lower drier felts passing about their respective driers and felt-rolls successively, and transferring devices or doctors extending from the surfaces of said driers to said felts at points adjacent their respective felt-rolls to conduct the paper from the driers of one series to the felts of the other series, substantially as described. a

8. A paper-drier comprising a double series of driers, one arranged above the other, in which the paper-web is successively passed alternately from a drier of one series to a drier of the other series, each lower drier being respectively located in advance of the next succeeding upper drier, an upper and a lower drier felt, an upper felt-roll adjacent each lower drier and in the rear thereof, and a lower felt-roll adjacent each upper drier and in advance thereof, said upper and lower drier felts passing about their respective driers and felt-rolls successively, and transferring-plates or doctors having sharp edges resting against the surfaces of said driers and extending over said felts at points adjacent their respective felt-rolls to conduct the paper from the driers of one series onto the felts of the other series, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WALLACE WHITE.

Witnesses LoUIs H. HARRIMAN, H. B. DAVIS.

too 

